![]() ![]() The steady state value was reached in 267 milliseconds. The inrush current was 7.26 times the steady state run current of 12.4 amperes. The momentary interruption test and the cold load pickup test showed an average inrush current of 90 amperes which lasted for 117 milliseconds. ![]() But we'll help you find the recommended output power of the AC that will best suit your room. Of course, the choice of brand and air conditioner type still depends on you. The test after a 25 cycle interruption produced lower inrush current and shorter times to reach steady state, 6 – 17 amperes and with 217 milliseconds to reach steady state.Īlso tested was a 3 ton air conditioner. Use this air conditioner BTU calculator, or AC BTU calculator, to help you decide what size of the air conditioner to buy, so you can efficiently cool your room. It took 483 milliseconds to reach the steady state condition. The average inrush was 7.5 times the steady state run current of 2 amperes. The test results showed an average inrush current of 15 amperes and a maximum of 18 amperes. Similar tests were conducted with on a ¼ HP refrigerator motor. Sparta NJ 07871 (800) 227-0729 A/C Cooling Load calculation and measurement When we talk about sizing an air conditioning appliance (tons of cooling, BTU/h or KW), we are specifying the cooling capacity (power) that needs to be moved by the appliance (air conditioner) from the indoor space to outdoors. A surge factor of 3x should be used for kitchen appliances and other electronics equipment, and surge factor of 1x for resistive loads.Īnother more interesting document on Cold Load Pickup Issues also shows similar inrush current figures. I found this mentioned in an Off grid guide by Ja圜ar.Īustralian Standard AS4509.2 states a surge factor of 7x the continuous power should be used for electric motors, water pumps, fridges, air conditioner, and washing machines. Get Estimates Now Cost data is based on research by HomeAdvisor. Why would you like a thinner cable, if it is to save cost then the length is likely subtantial and therefore more of a reason to use thicker conductors.Īlso the electricians are aware that compressor devices have very large inrush currents that are supported by thicker cables. 200 - 500 Find out how much your project will cost. You do not indicate so I wonder if you have considered the cable run length. ![]()
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